Electric furnace resistor



1,645,293 Oct. 11 1927. T. A.

ELECTRIC FURNACE RESISTOR Filed June 25. 1921 WITNESSES: f E. INVENTOR Emmi/6'. Paid ATTORNEY 'efi'ective to maintain the vertically extending portions of the helix in a taut condition during the operation of the furnace. As the metal used for the resistor is of a chara'cter adapted to withstand relatively high temperatures and has a relatively large coefficient of linear expansion, this provision for maintaining a ribbon resistor taut is an important element of my invention.

It may furtherbe noted that, by the use of the device embodying my invention, I am able to so wind the resistor member that the [lat surface of a-ribbon is available for radiating the heat generated into the furnace chamber.

It may further be noted that the device embodying my invention provides a heating" element for an electric-resistance furnace which may be easily and quickly installed or removed.

Various mmlilications may be made in the device embodying my invention without departing from the spirit and scope thereof, arid I desire that only such limitations shall be placed thereon as are imposed by the prior art or are specili ally set forth in the appended claims.

I claim my invention:

1. An electric furnace comprising a plu rality of walls enclosing a furnace chamber, a plurality of ahn d, spaced refractory 'members-located in certain of said walls and extending into said chamber, a notched refractorybar supported by certain of said refractory members, a second notched refractory bar located in opposite parallel-spaced relation to said first bar and a metallic resistor helically wound HIOUIN said two bars and supported in the notched portions of one of said bars.

2. An electric furnace comprising a plurality of walls enclosing a furnace chamber. a notched refractory bar supported in said chamber in spaced relation to said walls. a helically-wound resistor member supported in the notches of said bar and means engaging said resistor member for maintaining the lower portions of said resistor loops in spaced operative relation in said furnace chamber under all operating conditions.

3. An electric furnace comprising a plurality of refractory walls encl sing a furnace chamber, an elongated single member of refractory electric-insulating material supported in said chamber in spaced relation to one of said walls, a resistor member of substantially flattened helical-shape dependmg from said elongated member, and a second elongated single member, of refractory electric-insulating material, engaging the lower ends of the helices of said resistor member and supported thereby. I

In testimony whereof, ll have-hereunto subscribed my name this 20th day of June,

THOMAS A. REID. 

